<template>
  <div class="type-nav">
    <div class="container">
      <div class="nav-left" @mouseenter="isShow = true" @mouseleave="moveOut">
        <h2 class="all">全部商品分类</h2>
        <transition>
          <div class="sort" v-show="isShow" @click="toSearch">
            <div class="all-sort-list2">
              <div
                class="item"
                :class="{ item_on: currentIndex == index }"
                v-for="(c1, index) in categoryList"
                :key="c1.categoryId"
                @mouseenter="moveIn(index)"
              >
                <h3>
                  <a
                    href="javascript:;"
                    :data-category1Id="c1.categoryId"
                    :data-categoryName="c1.categoryName"
                    >{{ c1.categoryName }}</a
                  >
                </h3>
                <div class="item-list clearfix" v-show="currentIndex == index">
                  <div class="subitem">
                    <dl
                      class="fore"
                      v-for="c2 in c1.categoryChild"
                      :key="c2.categoryId"
                    >
                      <dt>
                        <a
                          href="javascript:;"
                          :data-category2Id="c2.categoryId"
                          :data-categoryName="c2.categoryName"
                          >{{ c2.categoryName }}</a
                        >
                      </dt>
                      <dd>
                        <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                          <a
                            href="javascript:;"
                            :data-category3Id="c3.categoryId"
                            :data-categoryName="c3.categoryName"
                            >{{ c3.categoryName }}</a
                          >
                        </em>
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import { mapActions, mapState } from "vuex";
import { throttle } from "lodash"; // 之引入需要的包,不需要的不引入,减小项目打包体积
export default {
  name: "TypeNav",
  data() {
    return {
      currentIndex: -1,
      isShow: true,
    };
  },
  computed: {
    ...mapState({
      categoryList: (state) => state.home.categoryList,
    }),
  },
  mounted() {
    if (this.$route.path != "/home") {
      this.isShow = false;
    }
    // this.getCategoryList();
  },
  methods: {
    // ...mapActions(["getCategoryList"]),
    moveOut() {
      this.currentIndex = -1;
      if (this.$route.path != "/home") {
        this.isShow = false;
      }
    },
    // 这是节流 给鼠标移入事件添加节流
    moveIn: throttle(
      function (index) {
        // console.log(index);
        this.currentIndex = index;
      },
      50,
      { trailing: false }
    ),
    toSearch(e) {
      // e.target 拿到触发事件的目标元素,我们需要点击的是a标签
      if (e.target.nodeName != "A") {
        return;
      }
      const { category1id, category2id, category3id, categoryname } =
        e.target.dataset;
      const query = {};
      category1id ? (query.category1Id = category1id) : "";
      category2id ? (query.category2Id = category2id) : "";
      category3id ? (query.category3Id = category3id) : "";
      query.categoryName = categoryname;
      // 解决params的丢失问题
      const location = {
        name: "search",
        query,
      }
      if (this.$route.params) {
        location.params = this.$route.params
      }

      // this.$router.push(location);

      // 解决跳转问题
      if (this.$route.path == '/home') {
        this.$router.push(location)
      } else {
        this.$router.replace(location)
      }

    },
  },
};
</script>

<style lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: pink;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;

            a {
              color: #333;
            }
          }

          .item-list {
            // display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 600px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          // &:hover {
          //   .item-list {
          //     display: block;
          //   }
          // }
          &.item_on {
            background-color: skyblue;
          }
        }
      }
      &.v-enter{
        height: 0px;
        opacity: 0;
      }
      &.v-enter-to{
        height: 461px;
        opacity: 1;
      }
      &.v-enter-active{
        transition: all .7s;
      }
    }
  }
}
</style>
